Furnace fire box and arch structure



April "2, I935 J. c. CHAPPLE I FURNACEFIRE BOX AND ARCH STRUCTURE Opiginal Filed May 29, 1931 J: 6'. ahappzeiwen O! a. aw

Gttomeg Thisinvention relates to furnace fireiboxand Patented Apr. 2, 1935 28, 1934, Serial:-

= i we" ar-ch structures, and has for j its primary 'Ejo'bje'ct and purpose "to provide thefire box: with water circulating elements' extending-therethrbughhev ing means for supporting an arch 'wall compo sed of refractory bri'cfks*0r unit's of standard. form and with the rear u per end of the wall s'dd v'm warclly curved vor inclined 'to deflect-the course of" flow of the products of 'combfustion intocontact with-the fire door, side and crown-sheets of the f'Ihe n'oveltfeature of my inve'nti'on i nfthisr'efspect is more particularly"-characterized lbyan improved-type of Water 'circ ilatingf element extending through the firebox uponwhich the-arch is 'support'e'd so c'enstructecl as to obviate 'the formation of steam holding or retainingpockets.

'7 The present'applica'tion isaud'i vision of my co pending application Serial" No. 510,943; filed May 29; 193 1; '"andha/s'rnore particular reference to the novel construction-of the water: circulating -eleand have vertically elongated-end]seeticns with parallel side walls adapted to -o'pe1'1 thrbli'ghfthe dc'oi' sheet oftheiirehox. 1

' With the alidve and other 'obj'ects 'in view, the invention' consists in the improved furnace-fire box and arch structure as will behereinaftermbre fully "describei'f' illustrated in the accompanying drawing, and" subsequently incorporated inTtlie sub'joined 1i. :5 t'

' In the drawingQWherein Ihave disclosed a simple and practical embodiment of the essen tialieature's ofmy improvements, m-"wmcnsi ilar reference Characters designate-cert endi'ng parts throughout the several views l x i f Fighrel is a vertical fragmentary sect onal viewillustrating an embodiment of: the} invention as applied to alec InOtiVefirebOX', said secti'on-being taken substantially-en the" line l-'l of'Fi'gure' 2,'and 1 1 2 is a transverse section taken through the'same substantially on 1ine-z' z;qf Figlocomotive boiler constriiction',; and if? the"co'nf-' urel; I r a v Modern high powered locomotives are pro-'- videdl with boiler fire boxes of appreciabl'y g'reater length 1 than those heretoforefused' in standard verition'al type ofEarch -is proportionatelv"{ex 'tendedre'arwardlvtowards the; the box door sheet, the space 'between the' top "of the arch "and the crown sheet is t'eo" greatly restricted;' lffthe comparatively "short 'a'rch is 'iisd, theprodiicts of combustion pa s s over the rear end of the arch fortvardly to'the boiler flues together withconsidsh ets; an -@cmwn: shee p a re results i e'inasieq t s aml md ct n sedan: V mam al-co s ptio *ofiue g a nvaocoene de .i pplication vfor;pa ina t fi ed'o e e da h e- 'W iJ av 1 di c qsc an;-,imp o e ar hrstru r ture for use' -in connection with: relatively Y long fire bo t pp r ar e d-"embody n ,meansxfor deflecting the; products j piwcombustion with t e ea de: sheet fl dporf s eet n crown. sh x i the fireho aand-wh h;obvi undue; restriction ot; the space-between git-he .tOP'

enable arch to beiu d;

"downwardlyt w ds t e-fue and n r -tmi watarfaciraulatingtuhes. .;and= :siphens. convene t nalt f r I have -dis los d:in;said;ep licati n,

refractory tileonbrlckconstitutiflfithe upperend 01 the amch of a ycertaz n novel form andai con struction.-

g pose :bi m ens p lm pres nt r vnmen '7 ;.to accomplish this; same-general result with -the use 'Qf 8I1 EEIChJeFOmPOSGQYWhOHY of. refr wry 'bricks-orunitsroistanderdiorm;

essential feature of ;my-=inve ntion :as; applied to a lo om tivegiire 0x,: d signate 'ithelfi est oor sheet of the: rear end f-the-fire box, fiitheafiue sheet atthe ferwazfd end thereof"?! thesfiretubes extending liflw wardly fromjthe flue]; sheet ,in"

rearwardly offset a relation thereto. In these respects thes'bqiler fire, box islof conventional form, and it will therefore; pevunderstoodthatthe boiler water surrounds-and is in direct eontact with the enter surfaces-of these;meta.l -wells or sheets-.0 f"v the the box. I

; 3 obliquely-t inclined water /circulating e2 te longitudinally -throug h the fire box from the throat sheet 9 1p; the fire' door: shee,t; 5: herein; shown, each or these :tubes includes a, forward:

section l 9 opening -;,at its; lower endi'through the oa sn r Balsam t be-sect o h v lqwer r i n pm wh sr ermre i s t an t upper portion thereof te rprovide Jongitudin ally extending shoulders H on each sideyof said'tube ct e 5.5 7 195111 en w r heim re ti n" one its lower side, islongitudinally curvedasjn (ligated? [3; "t e shoulders, I H

throughout this c rved-part; or jth tiiliellincon 'r centric] r t on" th ii qc ,The' upp r, p io f.

r ubega lti si r section '1 I 2 gradually merges into" the vertically tube which opens at its. upper end through the i I fire door'sheet adjacent to the crown sheet 8.

The walls of the lower curved portion I210! the tuberand the shoulders II are gradually merged 7 into the opposite side walls of the flattened-tube 3 sections 13 sojas toavoid the. formation 01in- "ternal steam holding or -retaining pockets'in the tubewallsif,

As shown'in the drawing aseries of such water ycirculating tubes in any desired nurnbermay'beq arranged in transversely spaced relation vthrough the fire box and upon the shouldersl'l'iot these 3 spaced tubes, the arch forming brick grille-of refractory material, indicated at ll; 9. e supported 'at' their opposite "ends; tauspreyeamg the direct passage of the products iii-combustion upwardly between the tubes in this portion of the fire box and causing the same to fiowlongitudinally along and in contact-with said tubes in-the rear-ends o! memmwan; i 'I"he bricks =14 are'of a standard form'widely'used 'in such-locoby reason of the curved-rearsendportions 'ofthe motive arches hav'in'g upper andlower :s'urifaces with the lower concave suriaces" thereof 7 opposed'to the melt bed) A8- in -the drawins,

' shoulders [[bfth-sllpbbrtlh?tubes-the brick forming the rear end or the arch 'wall will be successively'supporte'd at difl'erent -anglesand 7 :that the gases andproducts of com'bus'tio s extensive wall area; "further "increases the I. so, maximurnextraction or .heatir'rom tne burning While any preferred meansmay" be employ d together form fa rearwardly extending flatwawardlys curved or; inclined deflecting section so ill bedirectd by? said u 'r rear and ime wall rearwardly and' downwardly toward the fuel bed and into o tact: with the 'fire' door sheeti;

solid fine" particles''' of fuel jcarried in "sus- .;pension" by "the gasesg are thus returned to the zoneot intenser heat where {they will beignited.

Thus; by causing the productsof combustion to directlyicontact' with and fi'ow upwardly long the heat units W 1 b l d e 011 'stanqany pylmdricarsegmonv at its othetflend 1e na simr .l om: e v ti a y elo ate s ct o "and an arch wall supported substantiallxiwholl f of the water into steam. i Also, the products of 5" combu tion ar thereby" to 'come'into al rec'tj contact with "the rearend portion of the crown sheet 8, as wellas with the portions 13' oil the water circulating tubes a relatively ases and degenerat on ol stear'ninthe boiler.

"for the purpose of, the rear downwardly inclined brick u of 'the arch upon the siipportmg shoulders I I, for this purpose, 'Iprefer-fto "weld or otherwise permanently secure-'tdth'eoDDOS t,

" sides of the water-circulatingtubes thesh'ort lugs :or' trunnions indicated at I which' effectively 7 prevent'the downward sliding ,move'meneo the a0 7 a 'I have herein 'showni'one" embodiment of the essential features of'my linvention 'but {it 15' am be understood that the same might also be incorporated 'various other alternative structure I forms, Y and; I accordingly reserve {the privilege of V adopting all 'such legitimate chan'ges' therein as "may be fairlyfincorporated the "spirit and scope of the; invention. asjclaimed. 5 "f f"rwhat'is'clainiedis-z- V v J 7 am i onib he iqn iwli j a; q l veibdi er I ffire box; water circulating tubes extendinglon gitudinally through thefire box between'thedoor sheet and throat sheet jthereof, each 01.5 am

tubes including a vertically elongated endsec;

:.1,9ee,o 9' t 7 e nected at their upper and lower edges, said end' section of the tube opening through the door,

sheet of the fire box betweenthe door opening and the crown sheet, and; the remaining portion of said tube "being, of substantially "cylindrical form andconnected with the-throat sheet of the fire box, and march walltsupportedsubstantially wholly upon saidcylindricalportions of thewater circulating tubes'and tern 'inating tlitsijr'ear .e'nd at the juncture between said' cylindrical and elongatedPOItions of the tubes and in' spaced r e* tween gthe door op'eii'ihB ,.-and the crown sheet, the remaining portion of said tube being of sub- Jstantiallywylindrical jormi and connected :to the :throat sheet of ...the fire box, and: antarch ,-:wall

tubes-and extendingtherebetweenu e I f 3;:Jn combination with 'a-lqeomtive boiler are $98,: watericirculat-ing,tubescextending longituidinally through the fire boxabetween the door f throat sheets thereof, ,aeachot wsaid tubes having 7 1a zvertioally 'erelonsated -endzsection lopenlngsinto the door sheet and; having .a substantiallyjcylin drical section" opening" through thethroatwsheet not the; fire boxjand an arch walljsupported up the cylindrical portions, o the tubes and being substantially coextensive {with said cylindrical portions oi the; tubesgandgeterxnlnatln'sgatiathe iiuncturetthere f wi h the 1 yerticallyr elon at 1 tubegsections. .7 4:, v t

i 51; 1 In ',.combination with a locomotive boiler fire box; water eirculatmgtubes, extending glength in th tire b x betwe the or and'throat ipes the n; e c 01525811 t bes having 'ax-ve'rported upon saidgcylindrical portions of ithe I .tic i r e o a d S ct n :1 at o nd and a, 1110+" f upon the cylindrical portion of 'thetubes andiexjtending t rou hout the t s cf, the icylindri cal portions thereon;

ish'et eed a s subst t c l d a eoppor e nsi e ti s e d n om th e i elongated sectionsand. opening through the throat sheet Iofj the fire-gbox, and archfwall zs ilne q gthe rc mir e o s o the tubes: and extending I. thi' ughout the, lengths or r hleu he fire box be w hedo r: 'sheetand throat sheet thereof, each of 'saidtubes including a vertically elongated end section ,openingthrough the door sheet and -havingloppd- 'siteend. portions of glubstantiallyja cylindrical? iorm extending from the vertically elongated see? i ailo omoi r l oil r-flre box, water 'circulating tubes iextending length wise in the fire box and having vertically elon e e-en e ti ns th ou h the ,do rtions .and opening, through,the throat sheetpoi f .thefire box; and an; arch; wall supported asubantiaiiy-vwholly uponaid c ind al" o t ons of the tubes and terminating at itsrear endat the juncture between the @ticallyelongated sections Of thetube. s

iy d a a dtheve i-f 

